main.cpp

00001 #include "mbed.h"
00002 Serial pc(USBTX,USBRX);
00003 
00004 // Hall effect sensor
00005 DigitalIn hall(p21);
00006 DigitalOut hallpwr(p22);
00007 
00008 InterruptIn event(p21);
00009 DigitalOut led1(LED1);
00010 DigitalOut led4(LED4);
00011 
00012 int hallvalue;
00013 int hallstatus=0;
00014 void trigger()
00015 {
00016     while (hallstatus!=0) { // when triggered the lead will send out a light and reset the  hallstatus
00017         led1=1;
00018         wait(1);
00019         led1=0;
00020         hallstatus=0;
00021     }
00022 }
00023 int main()
00024 {
00025     hall.mode(PullUp); // brings up the sensor values
00026     hallpwr=0; // sets the power readings
00027     wait(0.2);
00028     hallpwr =1;// sets the power readings
00029     wait(0.2);
00030     event.rise(&trigger); //starts the outside tigger fuctions when something happens on pin 21
00031     while(1) {
00032         hallvalue=hall.read();// reads in hall effect values of (0 &1)
00033         if (hallvalue==1) { // if the value read in is 1 then there is a change in status
00034             hallstatus=1;
00035         }
00036         pc.printf("hallvalues:%d\n\r",hallvalue);
00037         wait(0.25);
00038     }
00039 }